Diode Tests - SEFRAM MW3105 Manual

6. Resistance measurements: Read resistance at display in , k, or M as shown by annunciator symbol.
Continuity measurements: Audible tone sounds when resistance is less than about: 40 ohms.
7. Switch meter to OFF when readings are done to conserve battery power.

3.4 DIODE TESTS

Remove power from circuit under test before making diode measurements.
1. Verify that power is off and that any capacitors are discharged in circuit about to be tested.
2. Set function selector to
Continuity is the default symbol.
3. Plug black test lead into COM plug. Plug red lead into HzF
4. Connect black test lead to cathode of diode, red test lead to its anode. Typical forward voltages should be about as follows:
Silicone diode: 0.7 V.
Germanium diode: 0.3 V.
5. Reverse test leads, black to anode, red to cathode. Voltage reading should be: 3.1V.
6. Note: Make sure that correct reading is obtained in forward and reverse positions. If diode is partially shorted, the same or
higher reading may be obtained in both positions. If diode is open, an overload OL may be shown in both positions.
7. Switch meter to OFF to conserve power when tests are done.
position.
CAUTION
plug.
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